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minimization: add link to autocrypt minimal certificate format

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Heiko Schaefer 2023-11-17 19:27:52 +01:00
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book/source/04-certificates.md
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@ -376,6 +376,10 @@ Some implementations, such as Sequoia, prefer to rely on the full historical set
An example for the tension between minimization and nuanced verification of the [temporal validity](temporal-validity) of signatures can be seen in the case of [rpm-sequoia](https://github.com/rpm-software-management/rpm-sequoia/issues/50#issuecomment-1689642607). To handle the limited availability of historical self-signatures on certificates in the wild, the rpm-sequoia implementation was adjusted to accept self-signatures that predate the existing self-signature for the signing key.
#### Autocrypt
The Autocrypt Level 1 specification defines a specific [minimal format for OpenPGP certificates](https://autocrypt.org/level1.html#openpgp-based-key-data) that are distributed by the autocrypt mechanism.
#### Autocrypt/WKD minimization
Email clients depend only on a limited subset of the components of certificates. Thus, it's possible to use a smaller view of that certificate, which is easier to transfer by mail user-agents.